void main() {
  printString('张三', address: '中国');
  printString('李四', age: 18);
  printString('王五', address: '深圳');
  printString('赵六', age: 19, address: '广州');
  printString('钱七');
  printString('孙八', age: 20);
  printString('周九', address: '上海');
  printString('吴十', address: '广州');
  printString('郑十一', age: 21);
}

void printString(String name, {int? age = 11, String? address = '深圳'}) {
  print('姓名：$name 年龄：$age 地址：$address');
}
